KVM: nSVM: Move TLB flushing logic (or lack thereof) to dedicated helper

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Introduce nested_svm_transition_tlb_flush() and use it force an MMU sync
and TLB flush on nSVM VM-Enter and VM-Exit instead of sneaking the logic
into the __kvm_mmu_new_pgd() call sites.  Add a partial todo list to
document issues that need to be addressed before the unconditional sync
and flush can be modified to look more like nVMX's logic.

In addition to making nSVM's forced flushing more overt (guess who keeps
losing track of it), the new helper brings further convergence between
nSVM and nVMX, and also sets the stage for dropping the "skip" params
from __kvm_mmu_new_pgd().

Cc: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210609234235.1244004-7-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Sean Christopherson 2021-06-09 16:42:26 -07:00 • committed by Paolo Bonzini

parent 415b1a0105

commit d2e5601907

2 changed files with 30 additions and 10 deletions

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arch/x86/kvm/mmu/mmu.c

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38

arch/x86/kvm/svm/nested.c

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